Causes and consequences of sex-biased dispersal ... - ResearchGate

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1022 Neuhaus Table 1. Spearman’s correlations between sex ratio of adult Columbian ground squirrels (females per male, age >2), the probability of 159 male and 131 female yearlings to remain in their natal colony to the age of 2+, and overall density of adults (males per ha, females per ha, adult animals per ha; bold indicates a statistically significant correlation with p = 0.05 or less). ✙✙/ha indiv./ha sex ratio (✙/✚) yearling ✚✚ staying yearling ✙✙ staying ✚✚/ha 0.886 0.886 0.657 0.99 −0.886 p = 0.02 p = 0.02 p = 0.15 p
Causes and consequences of sex biases in animal dispersal 1023 Mating success of adult males and movement of yearlings within the natal colony Males who were born in the colony achieved a similar number of first matings (mean 1.66 ± 1.9) as males who immigrated into the colony (mean 2 ± 0.6). Out of 35 first matings observed, 23 were obtained by 14 males born in the colony and 12 were obtained by 6 immigrant males (z =−0.14, p = 0.9). In other words, 70% of all reproductively active males were born in the colony, attaining about 66% of the first matings, while only 30% were immigrants getting 34% of first matings. Among animals who stayed in the natal colony, three-year-old females stayed significantly closer to their natal area (16 m ± 3, 95%CI = 10-23) than males of the same age (54 m ± 15, 95%CI = 20-87; U-Test, z =−2.6, p
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Causes and consequences of sex-biased dispersal ... - ResearchGate

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